Nr. 1/2017

 
 

Revista Sudura 1/2017

The articoles abstracts are published in romanian and english languages

 

Steel - aluminium joints by fast alternative processes

Luis Norberto López de Lacalle1 , Gorka Urbikain Pelayo1 , Ibon Azkona2 , José-María Pérez3 , Victor Verbiţchi4*, Radu Cojocaru4 , Lia-Nicoleta Boţilă4 , Cristian Ciucă4 , Ion-Aurel Perianu4 1 Universitatea din Ţara Bascilor, Bilbao, Spania; 2 Firma Metal Estalki S.L., Ţara Bascilor, Spania 3 Centrul pentru Dezvoltare Tehnologică Industrială - CDTI, Madrid, Spania 4 Institutul Naţional de Cercetare-Dezvoltare în Sudură şi Încercări de Materiale - ISIM Timişoara, România e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract: Certain fast alternative processes are proposed for application to constructive elements of cars, tools or metal structures, with corrosion protection. Friction drilling was used for Ø7,3 mm holes, followed by form tapping for threading M8x1,25 and calibration by rotary broaching, for the following joints: a. 30 mm x 30 mm squaresection tubes of AISI 1045 steel and sheets of Al 5754 aluminium alloy (thickness 1.5 mm); b. 30 mm x 30 mm square-section tubes of AISI 304 stainless steel and sheets of Al 5754 aluminium alloy (thickness 1.5 mm). Friction stir welding (FSW) was used with tools having 2.4 mm long pin and four flat bevels, respective conical pin, by rotational speed of 1000-2000 rev / min, welding speed of 20-80 mm / min, for the joints: c. sheets of EN AW 1200 aluminium alloy (thickness 2 mm) with sheets of S235 steel (thickness 3 mm); d. sheets of S235 steel (thickness 1.5 mm) with sheets of EN AW 1200 aluminium alloy (thickness 2 mm). Measuring of the process temperature, size and metallographic analysis, shear or tensile testing, as well as corrosion tests have been performed. Keywords: dissimilar joints, steel-aluminium, alternative processes, fast processes, friction drilling, threading by form tapping, rotary broaching, friction stir welding (FSW).

The numerical modeling of induction heating process to joining Zircaloy – Stainless steel for nuclear applications

Marius Media1), Tiberiu Tudorache2), Călin Truță1) 1)Institutul de Cercetări Nucleare (ICN), Pitești 2)Universitatea POLITEHNICA București e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract: This paper presents the numerical modeling of static induction heating in vacuum of a binary assembly to obtain the zircaloy – stainless steel dissimilar metallic joint, by eutectic brazing without filling material in the contact area of two metals. The analyzed assembly is used in nuclear instrumentation. The magneto-thermal coupling used for numerical modeling is performed with FLUX2D professional software package based on the finite element method. The study aims the estimation of temperature field inside the pieces and at their interface, influence of thermal contact quality at interface on the brazing process performance, and working geometry optimization. The numerical analysis results are compared with experimental results, specifically with metallographic images that highlights the presence and aspect of the eutectic layer Zr 76% + Fe 24% (at.) formed by thermal diffusion, molten (>936oC) and then solidified at interface, layer which form the brazed joint. The numerical simulations allows us to choose the working method so that the brazed joint to be optimal from metallurgical, mechanical and geometrical point of view, in order to keep the coaxiality of pieces and to achieve enough mechanical resistance and adequate ductility. The data used in numerical simulations correspond to existing vacuum induction brazing installation at INR, which operate at constant frequency of 10 kHz. Keywords: zircaloy – stainless steel joint, finite elements method, induction heating, magneto-thermal coupling, Eutectic Zr-Fe 

Galati tradition in metal metamorphosis through art and welding

Luigi Mistodie1 , Carmen Cătălina Rusu1 , Costică Voicu2 1 Universitatea „Dunărea de Jos” din Galaţi 2 Industrial Parc SRL Galaţi e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract: Metal sculptures are a uniquely part of the Galati urban culture. The works exhibited on the Danube riverside and in different parts of the city endured over decades, representing symbols of harmony between the nature of the city between the waters, the local industry - city port, naval shipyard and steel plant - and the creative spirit of local sculptors doubled by the contribution and expertise of shipyard welders. Neglected for a long time, the metal sculpture concept raised to life by the organisation in Galati of new sculpture camps, in 2012 and 2016. The paper focuses in presenting some metal artworks created by the artists participating in the sculpture camps and aims to present practical solutions for supporting and promoting the activities in the field of welding, an indispensable procedure in the creation of artistic compositions and goods, by transforming and shaping the metal. Based on the reliable collaboration between the organizers of the sculpture camps and Faculty of Engineering from Galati, and on the good practices performed in welding engineering, the paper authors’ depicts some feasible solutions for accelerating the applicative activities in art and welding, engaging graduates and undergraduate students in different internships by assigning themes and projects having as final result the “metal art” works of medium or large dimensions. Keywords: welding, sculptures, metal art, sculpture camp

European standards harmonized with the European Directive related to personal protective equipment, applicable in welding and allied processes

Petru Țenchea Președinte ASRO/CT 39 – Sudare și procedee conexe E-QSE CONSULTING S.R.L. Timișoara e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract: The European Directives related to personal protective equipment, the international, European and Romanian standardization bodies active in this field and the harmonized European standards for personal protective equipment, specific to welding and allied processes, are presented. Keywords: European Directive, harmonized standard, welding, allied processes, personal protective equipment (PPE)

Development of the specialization „Welding engineering” at Polytechnic University of Bucharest

Ionelia Voiculescu, Gabriel Iacobescu Universitatea POLITEHNICA din București e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it., This email address is being protected from spambots. You need JavaScript enabled to view it.

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